Hi,
provided that x and y are always positive integers, this may be a good start:
tab = readtable('XYZ_Data.txt');
zarray = zeros(max(tab.Y),max(tab.X)); % you could also use NaNs
lind = sub2ind(size(zarray),tab.Y,tab.X);
zarray(lind) = tab.Z;
bar3(zarray); % you may want to reverse the direction of your z-axis if z is always <0
Note that I assume that there is only 1 z-value per x- & y- coordinate.
Best, Konrad
